private bool DestinationReached(byte[] receivedMessage, long responseTime)
{
int responceType = IcmpTools.GetIcmpType(receivedMessage);
if (responceType == 0)
{
Write("{0, 10}", responseTime + " мс");
return(true);
}
if (responceType == 11)
{
Write("{0, 10}", responseTime + " мс");
}
return(false);
}
public void Start(string host, bool needToViewDns)
{
IPHostEntry ipHost;
try
{
ipHost = Dns.GetHostEntry(host);
}
catch (SocketException)
{
WriteLine("Не удается разрешить системное имя узла " + host);
return;
}
catch (Exception)
{
WriteLine("Длина разрешаемого имени узла или IP-адреса превышает 255 символов.");
return;
}
IPEndPoint ipEndPoint = new IPEndPoint(ipHost.AddressList[0], PORT_NUM);
EndPoint endPoint = ipEndPoint;
Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.Icmp);
socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, RECEIVE_TIMEOUT);
bool isEndPointReached = false;
byte[] data = IcmpTools.GetEchoIcmpPackage();
byte[] receivedData;
int ttl = 1;
WriteLine("Трассировка маршрута к " + host);
WriteLine("с максимальным количеством прыжков " + MAXIMUM_JUMPS + ":");
WriteLine();
for (int i = 0; i < MAXIMUM_JUMPS; i++)
{
int errorCount = 0;
Write("{0, 2}", i + 1);
socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.IpTimeToLive, ttl++);
Stopwatch track = new Stopwatch();
receivedData = new byte[256];
for (int j = 0; j < PACKET_COUNT; j++)
{
try
{
track.Reset();
track.Start();
socket.SendTo(data, data.Length, SocketFlags.None, ipEndPoint);
socket.ReceiveFrom(receivedData, ref endPoint);
track.Stop();
long responseTime = track.ElapsedMilliseconds;
isEndPointReached = DestinationReached(receivedData, responseTime);
}
catch (SocketException)
{
Write("{0, 10}", "*");
errorCount++;
}
}
if (errorCount == PACKET_COUNT)
{
Write(" Превышен интервал ожидания для запроса.\n");
}
else if (needToViewDns)
{
ViewDns(endPoint);
}
else
{
string str_endPoint = $"{endPoint}";
str_endPoint = str_endPoint.Replace(":0", " ");
Write(" {0}\n", str_endPoint);
}
if (isEndPointReached)
{
WriteLine("\nТрассировка завершена.");
break;
}
}
}